Office Whisperer

export default (function (o, c, d) { var proto = c.prototype; proto.dayOfYear = function (input) { // d(this) is for badMutable var dayOfYear = Math.round((d(this).startOf('day') - d(this).startOf('year')) / 864e5) + 1; return input == null ? dayOfYear : this.add(input - dayOfYear, 'day'); }; });